* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
}

body {
    background: linear-gradient(135deg, #0a0a2a, #1a1a4a, #0c2b5e);
    color: #fff;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    padding-bottom: 60px;
}

/* 星空背景 */
.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.star {
    position: absolute;
    background-color: #fff;
    border-radius: 50%;
    animation: twinkle var(--duration) infinite ease-in-out;
}

@keyframes twinkle {

    0%,
    100% {
        opacity: 0.2;
    }

    50% {
        opacity: 1;
    }
}

/* 头部样式 */
header {
    text-align: center;
    padding: 60px 20px 40px;
    position: relative;
    background: rgba(10, 20, 50, 0.7);
    border-bottom: 2px solid rgba(100, 150, 255, 0.3);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
    margin-bottom: 50px;
}

.main-title {
    font-size: 4rem;
    margin-bottom: 20px;
    text-shadow: 0 0 15px rgba(100, 200, 255, 0.8);
    letter-spacing: 3px;
    background: linear-gradient(to right, #4facfe, #00f2fe);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #4facfe, 0 0 40px #4facfe;
    }

    to {
        text-shadow: 0 0 15px #fff, 0 0 25px #fff, 0 0 35px #00f2fe, 0 0 45px #00f2fe;
    }
}

.subtitle {
    font-size: 1.5rem;
    max-width: 800px;
    margin: 0 auto 30px;
    color: #aad1ff;
    line-height: 1.6;
}

/* 主内容区 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    margin-bottom: 70px;
    background: rgba(20, 30, 60, 0.6);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(100, 150, 255, 0.2);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: #4facfe;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 4px;
    background: linear-gradient(to right, #4facfe, #00f2fe);
    border-radius: 2px;
}

/* 卡片布局 */
.cards-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-top: 30px;
}

.card {
    background: rgba(30, 40, 80, 0.7);
    border-radius: 15px;
    width: 350px;
    padding: 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid rgba(100, 150, 255, 0.2);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 100, 255, 0.3);
}

.card-title {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #00f2fe;
    display: flex;
    align-items: center;
}

.card-title i {
    margin-right: 12px;
    font-size: 1.5rem;
}

.card-content {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #cce5ff;
}

/* 时间线样式 */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 40px auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, #4facfe, #00f2fe);
    left: 50%;
    margin-left: -2px;
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: 20px 40px;
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-content {
    background: rgba(40, 60, 100, 0.8);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    position: relative;
    border: 1px solid rgba(100, 150, 255, 0.3);
}

.timeline-content::after {
    content: '';
    position: absolute;
    border-style: solid;
    width: 0;
    height: 0;
    top: 30px;
}

.timeline-item:nth-child(odd) .timeline-content::after {
    right: -15px;
    border-width: 15px 0 15px 15px;
    border-color: transparent transparent transparent rgba(40, 60, 100, 0.8);
}

.timeline-item:nth-child(even) .timeline-content::after {
    left: -15px;
    border-width: 15px 15px 15px 0;
    border-color: transparent rgba(40, 60, 100, 0.8) transparent transparent;
}

.timeline-year {
    font-weight: bold;
    font-size: 1.8rem;
    color: #4facfe;
    margin-bottom: 10px;
}

.timeline-title {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #00f2fe;
}

/* 火箭发射动画 */
.rocket-container {
    text-align: center;
    margin: 50px 0;
}

.rocket {
    font-size: 5rem;
    animation: launch 8s infinite ease-in;
    transform-origin: center bottom;
}

@keyframes launch {
    0% {
        transform: translateY(0) rotate(0);
        opacity: 1;
    }

    10% {
        transform: translateY(-30px) rotate(-5deg);
    }

    20% {
        transform: translateY(-70px) rotate(5deg);
    }

    30% {
        transform: translateY(-150px);
    }

    40% {
        transform: translateY(-300px);
        opacity: 1;
    }

    50% {
        transform: translateY(-600px) scale(0.8);
        opacity: 0.7;
    }

    60% {
        transform: translateY(-900px) scale(0.6);
        opacity: 0.4;
    }

    70% {
        transform: translateY(-1200px) scale(0.4);
        opacity: 0.2;
    }

    80% {
        transform: translateY(-1500px) scale(0.2);
        opacity: 0.1;
    }

    90%,
    100% {
        transform: translateY(-2000px) scale(0.1);
        opacity: 0;
    }
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 30px;
    margin-top: 50px;
    font-size: 1.1rem;
    color: #aad1ff;
    border-top: 1px solid rgba(100, 150, 255, 0.2);
}

/* 响应式设计 */
@media (max-width: 900px) {
    .main-title {
        font-size: 3rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .timeline::before {
        left: 30px;
    }

    .timeline-item {
        width: 100%;
        left: 0 !important;
        padding-left: 70px;
        padding-right: 20px;
    }

    .timeline-item:nth-child(even) .timeline-content::after {
        left: -15px;
        border-width: 15px 15px 15px 0;
        border-color: transparent rgba(40, 60, 100, 0.8) transparent transparent;
    }

    .timeline-item:nth-child(odd) .timeline-content::after {
        left: -15px;
        border-width: 15px 15px 15px 0;
        border-color: transparent rgba(40, 60, 100, 0.8) transparent transparent;
    }
}

@media (max-width: 600px) {
    .main-title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .section {
        padding: 20px;
    }

    .card {
        width: 100%;
    }
}